Outlet closure

Abstract: An outlet stopper comprises a cap part (2) made of a resin and having a cylinder (22) which has a screw thread (24) on a side face, an outlet part (1) made of a resin and having a disk flange (11) which has a bottom face coated with an adhesive (15) and a hole (14) at the center and a cylinder (12) which is placed on top of the disk flange and has a screw thread (13) on the side face which fits the screw thread on the cylinder in the cap part, an opening blade (23) fixed to the inside of the cap part, and a stopping ring (3) which has a protrusion (31) projected outward, has a break (32) for opening the ring and stops insertion of the cap part and the outlet part into each other before reaching the fully inserted position. The outlet stopper can be easily attached to a package commercially available in a pouch form. By attaching the outlet stopper, packages of soft plastic bags can be handled in the same manner as packages having an outlet stopper, such as hard bottles. Thus, the major drawback of packages of a pouch form can be eliminated.

Description: The invention relates to a novel outlet stopper which can be attached to a package made of a plastic bag used for containing commercial products. Commercial products which have heretofore been sold in bottles of glass or hard plastics, such as milk, soy sauce, oil, cosmetics and other like products of a fluid or slurry form, are recently sold in packages of paper cartons, bottles of thin plastic sheets and bags of plastic films (pouches). Outlet stoppers are attached to paper cartons and thin plastic bottles. A necessary amount of the content is taken out each time from the package through the outlet stopper and the remaining amount is kept in the package by closing the outlet stopper. However, no outlet stopper is attached to plastic film bags of a pouch form. A pouch is opened by a consumer by tearing the film at a small cut made at an upper part of the pouch or by cutting an upper part of the pouch with scissors and the content is poured out from the package for use. When not all the content in the pouch is used but some amount is left unused in the pouch, the opening has to be closed with a clip or the like. This causes inconvenience for the consumer. To get rid of such inconvenience, pouches attached with an outlet stopper are sometimes used. However, this practice has drawbacks that a process of attaching a hard outlet stopper to a soft bag causes difficulty, that an outlet stopper attached to a bag causes problems in the process of packaging of commercial products by an automatic packaging machine and that an outlet stopper causes problems in transportation and packing of bags because of its shape projected from the bag. An outlet stopper for a packaging bag of pouch form recently became known (JP-A-1990-127254 and JP-U-1990-108872). This outlet stopper has a structure comprising a cylinder having a flange and can be attached to the surface of a pouch at the bottom of the flange with a pressure-sensitive adhesive by a consumer who has purchased the pouch. Part of the film of the pouch exposed to the inner part of the flange is then cut to open the pouch. The cylinder is closed with a cap into which an opening blade for cutting open the pouch can be inserted. The difficulty during production of a pouch, the difficulty during automatic packaging and the inconvenience on packing of bags can be eliminated by using an outlet stopper which can be attached to a bag by a consumer. However, this type of outlet stopper has the drawback that additional work, such as cutting the bag and constructing the outlet stopper, are required in the operation of attaching the outlet stopper and opening the bag by the consumer. A known tamper-indicating dispensing closure (US-A-4,583,665) comprises a tear band which is to be removed from the cap of the closure in order to enable the cap to be fully screwed onto the outlet part of the closure which is an integral portion of the container in order to open a foil provided at the upper end of the outlet part by means of wedges provided at the inside of a roof of the cap. Thus the container will be opened constantly for dispensing fluid material contained therein. Furthermore, a known pouring plug of a container (US-A-5,141,133) comprises a tubular blade separate from the roof of the cap of the plug and comprises a rotation-stop for stopping rotation of the tubular blade. A puncturing operation is obtained wherein a film over the preformed opening of a cardboard container is punctured by straight downward driving motion of the tubular blade. The present invention accordingly has the object to provide an outlet stopper which can be easily and safely attached to a packaging bag of a pouch form at any portion of such bag without the risk of inadvertently puncturing the bag, especially when it is filled. This object is solved in accordance with the present invention by outlet stoppers as defined in the independent claims 1 and 2, respectively. Preferred improvements are subject matter of the dependent claims. As result of extensive investigations undertaken by the present inventors with the object of developing an outlet stopper which can be attached by a consumer easily and firmly, there was invented an outlet stopper which can be attached at the bottom to a pouch-like bag by a consumer and by which opening the bag film and sealing the bag with a cap stopper can be achieved simultaneously with a simple operation of removing a stopping ring and closing the cap. Thus, (1) the outlet stopper of the present invention comprises: a cap part made of resin and having a cylinder which is closed with a roof at the top and has a screw thread on the inner side face; an outlet part made of resin and having a disk flange which is coated with an adhesive on the bottom face and has a hole at the center, and a cylinder which is placed on top of the disk flange and has on the outer side face a screw thread which fits the screw thread on the inner side face of the cylinder of the cap part; an opening blade made of a resin which is fixed downward at the center of the inner face of the roof of the cylinder in the cap part and has blade tips projecting below the bottom face of the disk flange when the cap part is fully screwed into the outlet part; and a removeable stopping ring which is wound round the outer face of the cylinder in the outlet part, is positioned between the lower end of the cap part and the top face of the disk flange in the outlet part to keep the blade tips at a position not reaching the bottom face of the disk flange in the outlet part by stopping insertion of the cap part into the outlet part before reaching the fully inserted position. (2) The present invention also includes an outlet stopper as described in (1), wherein the stopping ring has a protrusion projecting outward and a break to open the ring. (3) The present invention also includes an outlet stopper as described in (1) or (2), wherein the removeable stopping ring and the cylinder in the cap part are formed as a one-piece molded resin structure in which the stopping ring and the lower end of the cylinder are connected to each other through one or more connecting points. (4) The outlet stopper of the present invention also comprises: a cap part made of resin and having a cylinder which is closed with a roof at the top, a screw thread on the outer side face and a flange part projecting outward at the edge of the upper end; an outlet part made of resin and comprising a disk flange which is coated with an adhesive on the bottom face and has a hole at the center, and a cylinder which is placed on top of the disk flange and has on the inner side face a screw thread which fits the screw thread on the outer side face of the cylinder in the cap part; an opening blade made of resin which is fixed downward to the cap part and has blade tips projecting below the bottom face of the disk flange when the cap part is fully screwed into the outlet part; and a removeable stopping ring which is wound round the outer face of the cylinder in the cap part, positioned between the upper end of the cylinder in the outlet part and the bottom face of the flange part in the cap part and keeps the blade tips at a position not reaching the bottom face of the disk flange in the outlet part by stopping insertion of the cap part into the outlet part before reaching the fully inserted position. (5) The present invention also includes an outlet stopper as described in (4), wherein the stopping ring has a protrusion projecting outward and a break to open the ring. (6) The present invention also includes an outlet stopper as described in (4) or (5), wherein the stopping ring and the cylinder in the cap part are formed as a one-piece molded resin article in which the removeable stopping ring and the lower end of the cylinder are connected to each other through one or more connecting points. (7) The present invention also includes an outlet stopper as described in (4), (5) or (6), wherein the opening blade made of resin is fixed at the lower end of the cylinder in the cap part. Other and further objects, features and advantages of the invention will appear more fully from the following description. The invention will now be described in more detail with reference to the accompanying drawings, wherein: Fig. 1 is a side view of the outlet part in a first example of the present invention. Fig. 2 is a plan view of the outlet part in the first example of the present invention in direction A. Fig. 3 is a side sectional view of the outlet part in the first example of the present invention. Fig. 4 is a side view of the cap part in the first example of the present invention. Fig. 5 is a side sectional view of the cap part and the stopping ring in the first example of the present invention. Fig. 6 is a plan view of the stopping ring in the first example of the present invention. Fig. 7 is a plan view of the separate stopping ring used for another example of the present invention. Fig. 8 is a side view of the outlet part and the cap part connected with the stopping ring which are fitted to each other in the first example of the present invention. Fig. 9 is a side view of the outlet part and the cap part which are fitted to each other in the first example of the present invention. Fig. 10 is a side sectional view of the outlet part of a second example of the present invention. Fig. 11 is a side view of the cap part in the second example of the present invention. Fig. 12 is a side sectional view of the outlet part and the cap part which are separated by the stopping ring and fitted to each other in the second example of the present invention. Fig. 13 is a side view of the cap part and the stopping ring having a one-piece structure and used in another example. Fig. 14 is a perspective view showing a self-supporting bag and the outlet stopper of the present invention attached to the bag. Material used for the outlet stopper of the present invention is a resin. Kind of the resin is suitably selected without particular restrictions. A thermoplastic resin, such as polypropylene, high density polyethylene, low density polyethylene, linear low density polyethylene, high impact polystyrene, an ABS resin, polyvinyl chloride, a nylon, a polyester, a polycarbonate and the like, can be used when moldability is considered. The outlet stopper in the first example of the present invention is composed of an outlet part 1, a cap part 2 having an opening blade and a stopping ring 3. As shown, the outlet part 1 made of a resin has a one-piece structure composed of a flange 11 and a cylinder 12. A release paper 16 which has a hole at the center to form a doughnut shape and is coated with a pressure-sensitive adhesive 15 is attached to the bottom face of the flange 11. When the release paper 16 is removed, the pressure-sensitive adhesive is transferred to the bottom face of the flange 11. The flange 11 of the outlet part 1 is a disk and has at the center a hole 14 which is the outlet for pouring out a fluid. A cylinder 12 is attached to the top face of the flange 11 perpendicularly. A screw thread 13 is formed on the outer side face of the cylinder 12. In Figures 4, 5 and 6, the cap part 2 of the outlet stopper in the present example and the stopping ring 3 are formed to a one-piece molded structure. Figures 8 and 9 are side views of the outlet part 1 and the cap part 2 fitted to each other. In Figure 8, they are fitted to each other with a stopping ring 3 between them. In Figure 9, they are fitted without a stopping ring 3. The cap part 2 and the stopping ring 3 are connected to each other through four connecting points 30. The cap part 2 and the stopping ring 3 are molded simultaneously in a one-piece structure in which they are connected through the connecting points 30. It is necessary that the connecting point 30 as such a strength that the connecting point can be easily torn apart by hand. Width of the connecting point is varied depending on kind of the resin. It is suitably selected in the range of 3 mm or less. The cap part 2 of the present example is composed of a roof 21, a cylinder 22 and an opening blade 23. At the edge of the roof 21 in the cap part 2, the cylinder 22 is fixed in the direction perpendicular to the face of the roof. The roof 21 and the cylinder 22 together exhibit the function of the cap part 2 by covering the cylinder 12 of the outlet part 1. On the inner side face of the cylinder 22, a screw thread 24 which exactly fits the screw thread on the outer side face of the cylinder 12 in the outlet part 1 is formed. At the center of the roof 21, there is fixed an opening blade 23 which extends through the inside of the cap part 2 in the direction perpendicular to the face of the roof. In the present example, the opening blade 23 is molded together with the roof 21 in the cap part to form a one-piece structure. A separate opening blade may be fixed to the roof 21 by attaching and fitting together to form a connected structure, such as that shown in JP-U-1990-108872. The opening blade 23 has a form made by cutting an end of a cylindrical stick to a shape having a side view of a wedge as shown in Figure 5. The shape of the blade tip 27 of the opening blade 23 is not particularly limited but any shape with which a bag film is cut between the blade tip 27 and the hole 14 can be adopted. The diameter of the cylindrical stick of the opening blade 23 is approximately the same as the diameter of the hole 14 of the flange 11 in the outlet part 1. The blade tip 27 of the opening blade 23 exactly fits the hole 14. Because of this condition, the blade tip 27 of the opening blade 23 works as a sharp blade tip and cuts the film of a packaging bag by pinching the film between the blade tip and the edge of the hole 14 of the flange 11 in the outlet part 1. The length of the opening blade 23 is adjusted in such a manner that the blade tip 27 is projected from the bottom face of the flange 11 in the outlet part 1 as shown in Figure 9 when the cap part 2 is put over the outlet part 1 and screwed into it until it is not inserted any more. The width of the stopping ring 3 in the direction of height is adjusted in such a manner that, when the stopping ring is placed between the outlet part 1 and the cap part 2, the blade tip 27 of the opening blade 23 does not reach the bottom face of the flange 11 in the outlet part 1 to prevent cutting of the film, as shown in Figure 8. On the bottom face of the roof 21 of the cap part 2, a circular rib 25 projecting from the face of the roof 21 is formed in a concentric shape. When the cap part 2 is fitted onto the outlet part 1 and fully screwed onto it, a tapered face formed on the inner side of the upper end 17 of the cylinder 12 in the outlet part 1 tightly fits the tapered part at the outside of the rib 25. Thus, a perfect fluid tight condition is formed to prevent leak of the fluid out through the outlet stopper. In the cap part 2 of the present example, the fluid tight condition can be kept perfectly by the effect of the circular rib 25. Furthermore, because the diameter of the opening blade 23 is approximately the same as that of the hole 14 of the flange 11 in the outlet part 1, leak of fluid can be approximately prevented at the position of the hole 14 when the cap is put on. Therefore, the inside of the cap part 2 rarely gets wet with fluid of commercial products during ordinary operation of the stopper. The stopping ring 3 of the present example has a structure of a ring with a break 32 as shown in Figure 6. It also has a protrusion 31 projected outward from the periphery of the ring. The stopping ring 3 of the present example is molded in a one-piece structure together with the cylinder 22 of the cap part 2. Thus, the stopping ring 3 and the cylinder 22 in the cap part 2 form a ring sheet of uniform thickness. The ring is open at the break 32 because the shape of the stopping ring 3 is held by four connecting points 30 which connect the stopping ring 3 to the cap part 2. As another example of the present invention, a stopping ring 3 may be used in the form separate from the cap part 2. In this case, it is preferred that a break 32 of a ditch shape is formed at a position near the protrusion 31, as shown in Figure 7. When the protrusion 31 is pulled with fingers, the stopping ring can be opened at the break 32 and removed. The outlet stopper of the present invention is supplied in the form shown in Figure 8. A consumer who purchased a bag containing a commercial product peels off the release paper 16 at first. The bottom face of the flange 11 is attached with the pressure-sensitive adhesive 15 to the surface of the film at a point P in the upper part of the self-supporting pouch bag shown in Figure 14. Then, the stopping ring 3 is removed by pulling the protrusion 31. The cap is then closed by screwing the cap part 2 into the outlet part until it cannot be inserted any more. When the cap is fully closed, the film of the bag is cut at the edge of the hole 14 of the flange 11. When the film is cut, all the film of the bag is not cut off but a part remains without being cut and is left attached to the edge of the hole 14. Thus, mixing of the cut piece of the film into the content is prevented. Then, the cap part 2 is taken off from the outlet part 1 by unscrewing the cap part and the fluid contained in the bag can be poured out in a small amount. When the cap part is fully screwed into the outlet part again after pouring out part of the content, the bag can be sealed in a fluid tight condition with the circular rib 25 and the edge 17 at the upper end of the outlet part 1. Because sealing of the outlet stopper of the present invention against a fluid with the rib 25 and the upper end of the outlet part 1 is perfect, the outlet stopper can be attached to a part of a packaging bag below the level of the contained fluid. When the cap part 2 is screwed into the outlet part 1, the fluid tight condition of the outlet stopper 1 is formed at the moment that the bag is cut with the blade tip 27. Thus, leak of fluid from the outlet stopper is prevented. As another form of the present example, the stopping ring 3 may be used in the independent form separate from the cap part 2 as described above. The stopping ring 3 may be molded in a one-piece structure with the outlet part 1, as well. When a separate stopping ring is adopted in the present invention, the stopping ring can have a simple shape having neither a protrusion 31 nor a break 32. In this case, the outlet stopper is opened by taking off the cap part from the outlet part and removing the stopping ring which prevents the cap part from being fully screwed into the outlet part, followed by putting on the cap part again and screwing it fully onto the outlet part. The present invention is further described with reference to a second example in the following. The second example of the outlet stopper of the present invention is composed of an outlet part 1, a cap part 2 and an independently separated stopping ring 3. This example is different from the first example in that the cylinder of the cap part 2 is fitted into the inside of the outlet part 1. The outlet part 1 is composed of a flange 11 and a cylinder 12. A screw thread 13 is formed on the inner face of the cylinder 12. At the center of the flange 11, a hole 14 having a diameter approximately the same as the inner diameter of the cylinder is formed and a pressure-sensitive adhesive 15 and a release paper 16 are attached to the bottom face of the flange 11. The second example has a characteristic that plural opening blades 23 are formed at the end of the cylinder 22 in the cap part 2 and a hole having a diameter approximately the same as the hole 14 of this cylinder 22 opens. Thus, this example has the advantage that an outlet of a larger diameter can be formed when the size of the outlet stopper is kept the same. The edge at the upper end 17 of the cylinder 12 in the outlet part 1 is inclined with a taper, as shown in the sectional view of Figure 10. To the roof 21, a cylinder 22 having an outer diameter smaller than the diameter of the roof is attached in the perpendicular direction. An opening blade 23 composed of four blade tips arranged on the edge at equal distances is formed at the lower end of the cylinder. In the second example, because the blade tips of the opening blade 23 are formed at the end of the cylinder, the opening blade 23 fits exactly the hole 14 and an allowance between the diameter of the opening blade 23 and the diameter of the hole 14 is not required. A screw thread 24 which fits the screw thread 13 on the inner face of the outlet part 1 is formed on the outer face of the cylinder 22. The periphery of the roof 21 is made in a form extended from the upper end 17 of the cylinder in the outlet part 1. A circular ditch 26 having a section shown in Figure 12 is formed at a position where the roof meets the upper end 17 of the outlet part 1. The separate stopping ring 3 shown in Figure 7 may be used as stopping ring in the present example, as well. Figure 12 is a side sectional view of the stopping ring 3 shown in Figure 7 placed on top of the outlet part 1 and fitted to the cap part 2. As this side sectional view of the outlet stopper of the present example shows, when the cap part 2 is fitted into the outlet part 1 with use of the stopping ring 3 between them, the blade tips of the opening blade 23 is fitted into the hole 14 of the flange 11 and stops immediately before reaching the bottom face. After the outlet stopper is attached to the surface of a packaging bag with the adhesive 15 at the bottom face of the outlet part 1, the stopping ring 3 is removed by pulling the protrusion 31. When the cap part 2 is screwed into the outlet part 1, the opening blade 23 rotates and cuts the bag film by pinching it between the edge of the hole 14 of the flange 11 and the blade. The stopping ring 3 is placed near the roof 21 of the outlet stopper and the protrusion 31 can be easily picked up with fingers. When the cap part is closed after opening the bag and pouring out a small amount of the fluid content, the upper end 17 having a tapered edge in the outlet part 1 fits the circular ditch 26 on the cap part 2 and the bag is tightly sealed in fluid tight condition by the cap part 2. Like in the first example, the content is sealed to some degree by the edge of the hole 14 and the side face around the opening blade 23, and the sealing structure by the circular ditch 26 and the upper end 17 may be omitted in some cases. In the present example, the stopping ring 3 and the outlet part 1 may be formed in a one-piece structure, as shown in Figure 13. When this structure is adopted, the stopping ring 3 connected to the outlet part with connecting points 30 in the same manner as that shown in Figure 4 can be pulled out by means of the protrusion 31 and removed. In the second example, it is convenient for production that the stopping ring 3 and the outlet part 1 are formed in a one-piece structure. The outlet stopper of the present invention can be applied to packaging bags of conventional plastic bags without any restriction. It is particularly conveniently applied to packaging bags having self-supporting property because the bags can be handled with in the same manner as conventional hard bottles having an outlet stopper. Particularly, in self-supporting bags, such as those disclosed in WO92/21581, the self-supporting property is exhibited because of the structure of the bottom part and the property is improved further by a constriction formed at the upper part of the bag and also by linear ribs formed on the surface of the bag so that the upper part of the bag is provided with a self-supporting property as well as the bottom part. The packaging bag shown in Figure 14 is a self-supporting bag containing a fluid commercial product. The bag used here has two sealed side edges and a bottom of conventional steric structure of gazette folding to provide the bag with self-supporting property as well as a constriction N at the middle of the bag and curved ribs S on the surface of the bag, both to achieve the total self-supporting property including that for the upper part of the bag which contains a fluid to the fluid level L. When the outlet stopper of the present invention is attached to the position P at the upper part of the bag, the packaging bag remains self-supported even when the bag is almost empty. Thus, the bag can be conveniently stored by standing on a shelf in a similar manner to glass bottles and plastic bottles containing foods, detergents and the like and handled in a manner similar to glass bottles and plastic bottles. For example, a large number of the bags can be stored by standing side by side on a narrow shelf area, or a bag with an open stopper can be gripped with a single hand and can be inclined to pour out fluid contained in the bag in a similar manner as a bottle. The outlet stopper of the present invention is favorably used in combination with a self-supporting bag. It is convenient for use by a consumer and also for packing and transportation as the outlet stopper is contained in a hollow space 41 in the bottom structure of a self-supporting bag 4 having a self-supporting bottom structure of gazette folding by laying there or attaching to the bag with a pressure-sensitive adhesive material or a pressure-sensitive adhesive tape. To summarize the advantages obtained by the invention, by using the outlet stopper of the present invention, the outlet stopper can be easily attached by a consumer to a packaging bag commercially available in pouch form. After a small amount of the content is taken out, the remaining content can be kept in the bag for later use in small amounts. Packages made of soft plastic bags can be handled in the same manner as packages having an outlet stopper, such as hard bottles. Thus, the major drawback of packages of pouch form can be eliminated. Particularly, the stopping ring can be removed by simply pulling a protrusion with fingers. A consumer can easily attach the outlet stopper, which can be opened and closed at will, to a packaging bag of pouch form.

Claims: Outlet stopper for pouch-like packaging bags, comprising a cap part (2) made of resin and having a cylinder (22) which is closed with a roof (21) at the top and a screw thread (24) on the inner side face, an outlet part (1) made of a resin and having a disk flange (11) which is coated with an adhesive (15) on the bottom face and has a hole (14) at the center and having a cylinder (12) which is placed on top of the disk flange (11) and has on the outer side face a screw thread (13) which fits the screw thread (24) on the inner side face of the cylinder (22) in the cap part (2), an opening blade (23) which is fixed downward at the center of the inner face of the roof (21) of the cylinder (22) in the cap part (2) and has blade tips (27) projecting below the bottom face of the disk flange when the cap part is fully screwed into the outlet part, characterized in that, a removable stopping ring (3) wound round the outer face of the cylinder (12) of the outlet part (1) is positioned between the lower end of the cap part (2) and the top face of the disk flange (11) of the outlet part, keeping the blade tips (27) at a position not reaching the bottom face of the disk flange (11) of the outlet part (1) to stop insertion of the opening blade (23) of the cap part (2) through the outlet part (1) before reaching the fully inserted position of the cap part (2), the stopping ring (3) having a protrusion (31) projecting outward and a break (32) to open the ring (3). Outlet stopper for pouch-like packing bags, comprising a cap part (2) made of resin and having a cylinder (22) which is closed with a roof (21) at the top and a screw thread (24) on the cylinder, an outlet part (1) made of resin and comprising a disk flange (11) which is coated with an adhesive (15) on the bottom face and has a hole (14) at the center and a cylinder (12) which is placed on top of the disk flange and has a screw thread (13) which fits the screw thread (24) of the cylinder (22) of the cap part (1), an opening blade (23) made of resin which is fixed downward at the cap part and has blade tips projecting below the bottom face of the disk flange (11) when the cap part is fully screwed into the outlet part, characterized in that, the screw thread (24) is on the outer side of the cylinder (22) of the cap part (2), that a flange part projects outward at the edge of the upper end of the cap part (2), and that a removable stopping ring (3) wound around the outer face of the cylinder (23) of the cap part (2) is positioned between the upper end of the cylinder (12) of the outlet part (1) and the bottom face of the flange part in the cap part (2) and keeps the blade tips (27) at a position not reaching the bottom face of the disk flange (11) in the outlet part by stopping insertion of the cap part (2) into the outlet part (1) before reaching the fully inserted position. Outlet stopper as claimed in claim 2, wherein the opening blade (23) made of resin is fixed at the lower end of the cylinder (22) of the cap part (2). Outlet stopper as claimed in one of claims 2 or 3, wherein the upper end (17) of the cylinder (12) of the outlet part (1) is tapered and fits a circular ditch (26) in the cap part (2). Outlet stopper as claimed in one of claims 1 to 4, wherein the stopping ring (3) and the cylinder (22) of the cap part (2) are formed as a one-piece molded resin structure in which the stopping ring and the cylinder of the cap part are connected to each other through one or more breakable connecting points (30). Outlet stopper as claimed in one of claims 2 to 5, wherein the stopping ring (3) has a protrusion (31) projecting outward and a break (32) to open the ring. Outlet stopper as claimed in claim 1, wherein the opening blade (23) is molded together with the roof (21) of the cap part (2) as a one-piece structure.

Inventors: CHIGUSA KISAKU, TAKAGAKI TADAO, CHIGUSA, KISAKU, TAKAGAKI, TADAO, CHIGUSA, KISAKU, C/O MITA RIKA KOGYO CO., LTD., TAKAGAKI, TADAO C/OSUMITOMO BAKELITE CO.,LTD.
Applicants: SUMITOMO BAKELITE CO, SUMITOMO BAKELITE COMPANY LIMITED
Application year: 1994
Main classification: B65D75
IPC codes: B65D75, B65D51, B65D47, B65D77, B65D5, B65D65, B65D33